<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>02-回调函数形式的ref</title>
</head>

<body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>
    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel，用于将jsx转换为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">  //此处一定要写babel
        //创建组件
        class Demo extends React.Component {

            //展示左侧输入框的数据
            showData = () => {

                const { input1 } = this;
                alert(input1.value);
            }

            //展示右侧输入框的数据
            showData2 = () => {

                const { input2 } = this;
                alert(input2.value);
            }


            render() {
                return (
                    <div>
                        <input ref={c => this.input1 = c} type="text" placeholder='点击按钮提示数据' />&nbsp;
                        <button onClick={this.showData}>点我提示左侧的数据</button>&nbsp;
                        <input onBlur={this.showData2} ref={c => this.input2 = c} type="text" placeholder='失去焦点提示数据' />&nbsp;
                    </div>
                )
            }

        }

        //渲染组件到页面
        ReactDOM.render(<Demo a="1" b="2" />, document.querySelector('#test'));
    </script>
</body>

</html>